Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701, USA.
Sci Rep. 2016 Sep 12;6:33284. doi: 10.1038/srep33284.
Contrary to the historical data, several recent experiments indicate that the surface tension of supercooled water follows a smooth extrapolation of the IAPWS equation in the supercooled regime. It can be seen, however, that a small deviation from the IAPWS equation is present in the recent experimental measurements. It is shown with simulations using the WAIL water potential that the small deviation in the experimental data is consistent with the tail of an exponential growth in surface tension as temperature decreases. The emergence temperature, Te, of a substantial deviation from the IAPWS equation is shown to be 227 K for the WAIL water and 235 K for real water. Since the 227 K Te is close to the Widom line in WAIL water, we argue that real water at 235 K approaches a similar crossover line at one atmospheric pressure.
与历史数据相反，最近的几项实验表明，过冷水的表面张力在过冷区遵循 IAPWS 方程的平滑外推。然而，可以看到，最近的实验测量值中存在与 IAPWS 方程的微小偏差。使用 WAIL 水势的模拟表明，实验数据中的微小偏差与表面张力随温度降低呈指数增长的尾部一致。结果表明，WAIL 水的显著偏离 IAPWS 方程的出现温度 Te 为 227 K，而实际水的 Te 为 235 K。由于 227 K 的 Te 接近 WAIL 水中的 Widom 线，我们认为，在一个大气压下，235 K 的实际水接近类似的交叉线。
